Thingmajig is a fun and playful word used to refer to an object whose name is unknown or forgotten. However, there are several other synonyms that can be used interchangeably with thingmajig. Some of these words include doodad, trinket, gizmo, gadget, widget, doohickey, knickknack, and contraption. These words are often used when referring to small or insignificant items that are hard to identify or remember. While each word has its own unique connotation and usage, they all convey the same meaning as thingmajig. So, the next time you can't remember the name of an object, use one of these synonyms to add a little fun and whimsy to your vocabulary.